Thread drawing device



Jan. 9, 1934. N. DEUTSCH THREAD DRAWING DEVI CE Filed July 1930 Patented Jan. 9, 1934 UNETED STATES PATENT OFFICE 1,943,212 THREAD DRAWING DEVICE Nikolaus Deutsch, Budapest, Hungary Application July 8, 1930, Serial No. 466,606, and in Hungary February 3, 1930 3 Claims. (Cl. 11278) In woven fabrics perforated placesiopen work) plate the opening e for the passage of the pusher are produced by a number of warp threads being is widened in such a manner that the lower end forced downwards with a suitably formed pusher of the additional presser foot e which is fixed comprising a blunt-ended needle and cut off by to the presser bar b projects into this opening.

pusher will not work reliably. n in the cutter holder 9, g is pressed by means Thread drawing machines are known, in which of the helical spring h, the lower sharp edge e grippers are used, which perform a lateral moof the opening e acting as the counter cutting tion besides the motion in the forward feeding edge for the cutter n. The pusher k which is 65 direction, and the material is stretched over parfixed in the pusher bar 2 forces the longitudinal allel bars on the throat plate. This stretching threads of the material downwards, which are is however insufficient, as the material to be cut off in a known manner by means of the cutter perforated oifers a relatively great resistance. n. The material m is guided between the feet a In these thread drawing devices, in which the of the presser bar and under the presser foot 2 70 downwardly forced threads are out oh by means which enters the opening e and holds the tenof apivoted cutter and the lower face of the throat sioned material in position as the pusher deplate has a circular recess, one edge of the pusher scends. hole acts as the counter blade. The cutter holder g, g swings to and fro in a In such arrangements, for reliably cutting known manner and the cutter n is pressed against 7.5. through the threads the lower circular recess in the arcuate surface e of the throat plate (1. the throat plate must be ground so as to corre- In the head 9 of the cutter holder is a slot 0 into spond to the sweep of the cutter, as otherwise which the cutter blade n is loosely inserted. The the threads will not be cut reliably between the lower end n of the cutter blade has the shape of rocking cutter and the stationary counter cutan arc, so that the cutter blade sets itself autoting edge of the throat plate. This disadvanmatically with its cutting edge against the countage is not only apparent in new machines owing ter cutting edge laterally at a certain angle, if the to the difficulty of grinding, but more particuarcuate surface in the throat plate is not corlarly when the circular recess in the throat plate rectly ground or is worn in places. The cutter 30 has become worn. An adjustment of the cutter blade may also be arranged to turn about a pin n is only effected by the helical spring, but the for obtaining the same result, as shown in Fig. 5. cutting edge of the cutter cannot adapt itself to In this case the lower end n of the'cutter blade the inequalities of the circular recess in the throat n does not bear against the bottom of the slot plate in the lateral direction. 0 and consequently need not have the shape of a 35 The present invention overcomes these disadcircular are but may be straight as shown. The vantages. lower end n however, must be spaced from the In the accompanying drawing a constructional bottom of the slot 0 by an amount suificient to example of the invention is shown. enable the blade n to turn about the pin n to g- 1 being a Side elevation Partly in Section, set itself automatically with its cutting edge 40 Fig. 2 a front elevation partly in section against the counter cutting edge in a similar man- Fig. 3 a longitudinal section through the throat her to the cutter blade n in Fig plate to an enlarged scale and What I claim Fig. 4 a front elevation partly in section of the cutter head with the cutter to an enlarged A devlce for drawm 45 scale.

Fig. 5 is a front elevation partly in section of a modification of the cutter head and cutter.

The throat plate d positioned between the feet a of the presser bar b above the feed dog 0 has and 11101111? P m the dlrectwn 1n "0 on its upper surface an inclined raised part e Whlch fabr1c 1s fed forward means for having two ribs 21 one on each side of an Open stretching the fabric tautly over the said ribs, a m 1 in the throat plate and which hold the cutter head capable of swinging to and fro with material taut While it is being fed forward, said respect to the throat p d u e head havribs being inclined upwards in the direction in ing a s t h n, a utt capable of s at 5 which the fabric is fed forward. In the throat laterally in the said slot and a counter cutting g threads from woven rics, comprising a throat plate having an opening therein, means for feeding the fabric 100 edge on the throat plate for coacting with the said cutter, as and for the purpose set forth.

2. A device for drawing threads from woven fabrics, comprising a throat plate having an opening therein, means for feeding the fabric forward over the throat plate, two ribs on the throat plate, one on either side of the said opening and inclined upwards in the direction in which the fabric is fed forward, means for stretching the fabric tautly over the said ribs, a cutter head capable of swinging to and fro with respect to the throat plate, said cutter head having a slot therein, a cutter having its lower edge in the shape of an arc and mounted loosely in said slot so as to be capable of oscillating therein and a counter cutting edge on the throat plate for coacting with the said cutter, as and for the purpose set forth.

a cutter mounted 3. A device for drawing threads from woven fabrics, comprising a throat plate having an opening therein, means for feeding the fabric forward over the throat plate, two ribs on the throat plate, one on either side or" the said opening and inclined upwards in the direction in which the fabric is fed forward, means for stretching the fabric tautly over the said ribs, a cutter head capable of swinging to and fro with respect to the throat plate, said cutter head having a slot therein, a pin in the said cutter head, loosely on the said pin so as to be capable of oscillating in said slot and a counter cutting edge on the throat plate for coacting with the said cutter, as and for the purpose set forth.

NIKOLAUS DEUTSCH. 

